Method of constructing pistons for fluid-pressure engines.



E. TALBOT.

METHOD OF CONSTRUCTING PISTONS FOR FLUID PRESSURE ENGINES.

APPLICATION FILED NOV. l6, 1914.-

N Patented July 17, 1917.

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nnnnsr TALBOT, or Lowns'rorr, ENGLAND.

METHOD or GONSTRUGTING PISTONSFOB rtnrn-rnnssunn nnerivns.

Application filed. November 16, 1914.

To all whom it may concern Be it known that I, ERNEST TALBOT, a subjectof the King of Great Britain, residing at Lowestoft, in the county ofSuffolk, England, have invented certain new and useful Improvements inthe Method of Constructing Pistons for Fluid-Pressure Engines, of whichthe following is a specification.

This invention relates to a method of constructing pistons for fluidpressure engines, of the type described and claimed in prior BritishPatent No. 13,273, A. D. 1910.

In pistons of this type it has been customary to form the gudgeon pinlugs or brackets integral with the trunk of the piston, either bycasting or forming the trunk out of a forging and cutting away thesurplus metal, or by pressing out of the wall of the piston carriers forthe lugs.

It is the object of the present invention to enable the trunk to beproduced with its gudgeon pin lugs by stamping or pressing so that thereis a minimum amount of ma terial employed, and little or no metal has tobe cut away in the construction of the In s.

Ihccording to this invention, the trunk is so pierced that a largeamount of metal is displaced at two points. opposite to one another.This displaced metal is then shaped to form the lugs.

The accompanying drawings show two methods of carrying out thisinvention. In Figures 1 and 2 of these the piston is represented invertical section, and in Figs. 3 to 6 in side elevation in variousstages of manufacture.

Like letters indicate like parts throughout the drawings.

The piston in each case comprises a cap part A (omitted in Fig. 1)carrying the piston rings, and a trunk B which is enlarged at C at whichpart it makes contact with the cylinder walls. The part B may becircular, or of any other suitable shape, and this part is eventuallyformed with lugs or brackets D, Figs. 4, 5 and 6, which carry thegudgeon pin.

The part B O is first formed to the preferred shape shown in Fig. 1 bystamping or other process. The flared metal joining the trunk B to thelower skirt 0 is then slit at two opposite points as indicated at F andG, forming T T shaped cuts. The metal is then forced from the interi routwa d y Specification of Letters Patent.

Patented July 1L7, 191?.

Serial No. 872,445.

at two opposite points by suitable tools,

such displacement extending into the length of B as far as may benecessary to give the proper diameter and length to the finished pistonpin bosses.

The preliminary operation leaves apertures E in the shape of archeshaving undivided connection with the trunk B and the flared metaljoining B to C, but being entirely open as to their back, front andbase. The stage reached by these operations is shown by Figs. 2 and 3.

The walls of the arches are then pinched together and riveted (orotherwise secured) as shown in Fig. 4.

In this way the piston pin lugs D can be produced integral with thetrunk portion.

In the modified construction shown in Figs. 5 and 6, the lugs areproduced as before described and illustrated by Fig. 4.- but instead ofbeing riveted or otherwise secured at the abutting webs E, these webs(as shown in Fig. 5) are cut away so as to separate the circular portionof the lugs from the flared metal.

The abutting edges of the lugs, the portion of the wall B, and theT-shaped cut in the flare, indicated by G, may then be brazed or weldedtogether. In such case the final lugs D are of simple cylindrical form,whereas in the construction illustrated by Figs. 2, 8 and l, the lugshave the additional support of the integral webs joining the undersideof the lugs to the flared portion connecting B and C.

By this means a light pressing or stamping can be used for the trunk ofthe piston, and the gudgeon pin lugs or brackets will still be formedintegral with the trunk.

What I claim as my invention and desire to secure by Letters Patentis 1. The hereindescribed method of producing pistons for use asdescribed which consists in first forming the cylindrical body of thepiston, slitting the body at two opposite points to form T-shaped cuts,forcing the metal from the interior outwardly to form diametricallyopposite apertures having arches open at the rear, front and base, andthen pinching the walls of the arches together to form gudgeon pin lugs.

2. The hereindescribed method of producing pistons for use as describedwhich consists in first forming the cylindrical body of the piston,slitting the body at two oppo- Site points to form T-shaped cuts,forcing the metal from the interior outwardly to name to thisspecification in the presence of form diametrically opposlte apertureshavtwo subscribing Witnesses.

ing arches open at the rear, front and base, 1 r pinching the Walls ofthe arches together ERNESl rlALBOl' 5 to form gudgeon pin lugs, and thensecur- Witnesses:

ing the said Walls together. H. D. JUMsoN, Intestimon'y whereof I havesigned my 0. J. WORTH.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. 0.

